Franco had become the OKJ leader after Vicky left OKJ in 1960 for Africa Jazz of Grand Kalle. He would be the leader in 1961. However, Vicky decided to return to OKJ in 1963. From there, Franco and Vicky were a force of nature together under the OK Jazz banter. Franco and Vicky would be great when they did their duets together. It was in great harmony. Franco was the second voice singer while Vicky was the first voice singer. Franco and Vicky would hang out and go to events. By this period, Vicky would be vice-president and Franco was president. Franco was younger than Vicky Longomba but thanks to Vicky's departure in 1960, Franco would be the sole leader of OKJ.
Franco and Vicky's relationship would go to a downhill in 1970. Why? According to World Service Fan (a African/Latin Blog), it was Simaro who played a role by bringing back Kwamy. Since Franco allowed Kwamy's return in OKJ, then Vicky would be angry and let to a fallout with Franco and Vicky left officially in 1971 to form a short formed band Lovy du Zaire. Kwamy would leave OKJ around 1972 and 1973 period before he would end his music career with Tabu Ley.
I got the impression that Vicky and Simaro were never friends. They seemed to just learn to tolerate each other for Franco's sake. At the end, Simaro won and his moves would get him to be Vice President of OKJ.